Yes, I know that the Anti-lock brake light is a touchy subject for this group.
I bought a used 91 Explorer. The light comes on during startup then goes out (passes self test?). About a minute later it comes back on reguardless if the truck is parked, running, use the brakes, or don't and I can lock the back wheels up.
No error code in the computer. I fixed the 3rd brake light. The gear on the diff is fine. I replaced the sensor. The old one was also a replacement (looks like I'm not the first trying to fix it). The RABS cable seems good.
So the next swap out is the control box behind the dash. I found a couple of modules and none have any markings. Does anyone know what the antilock control module looks like?